Radiometric Techniques for Emissivity and Temperature Measurements for Industrial Applications

Abstract

Radiometric techniques for temperature measurements are indispensable in industrial applications, particularly when the use of contact thermometers is hard or impossible to realize. The principles and realizations of some new and extended radiometric techniques for measuring the emissivity and temperature of an object are presented. Using the described techniques, the emissivity and temperature of an Inconel 600 sample at high temperatures in laboratory conditions were determined. The validation of the temperature measurement of the same sample in a simulated industrial condition is also presented.

Development of a Novel Pyrometer by Eliminating the Uncertainty of Emissivity Using Reflector with Two Apertures in Medium Plate Rolling Process

“…The surface of Inconel 600 can form a stable oxide layer when it is heated in air, and the emissivity does not change. It is often used as a reference for the accuracy verification of emissivity [14,15]. Reference [22] provides the normal spectral emissivity of standard oxidized Inconel, and we compare the measurement results of emissivity with this reference.…”

“…The surface has been assumed to be a gray body for a two-color pyrometer [9,10]. A mathematical model of emissivity has been established using multi-wavelength thermometry [11][12][13][14]. Because the assumptions and actual conditions are different, the temperature error sometimes even exceeds 20 • C. In addition, some research could measure emissivity with no assumptions.…”

Thermal Imaging Metrology with a Smartphone Sensor

“…However, effects from rather further afield can be significant too [ 21 ]. It has been proposed that de-convolution of IR device images with the unit PSF function [ 8 , 9 ] will produce a more accurate representation of the temperature distribution across the scene. In this case, uncertainty in measurement of the PSF has been shown to be the dominant source of uncertainty in final measured temperatures when utilising this deconvolution process [ 8 ].…”

“…Thermal imaging, thermography and radiation thermometry are widely applied techniques within a variety of manufacturing industries, military applications, medical diagnostics and academic research domains. The most common commercial applications of thermography are found in semiconductor processing [ 1 , 2 , 3 , 4 ], the plastics industry [ 5 , 6 ] and metals processing [ 7 , 8 , 9 , 10 ]. In addition to these applications that are significantly above ambient temperature, thermography under ambient conditions is also applied within the medical sector [ 11 , 12 ].…”

The European project on high temperature measurement solutions in industry (HiTeMS) – A summary of achievements

“…The activities within this workpackage involved the development of various techniques for emissivity mitigated temperature measurement methods, emissivity measurement and investigation of sources of measurement uncertainty such as geometries of surfaces under measurement and large scale size-of-source effect (SSE) [4,5].…”